btroops/src/radial.js

if (window.IS_DEV) {
  const source = new EventSource('/esbuild');
  source.addEventListener('change', () => location.reload());
}

const xmlns = 'http://www.w3.org/2000/svg';
const svg = document.querySelector('svg');

const hex = {
  inradius: 8.66,
  circumradius: 10,
}

const horzSpacing = hex.inradius;
const vertSpacing = hex.circumradius * 3 / 2;


function toKey({ q, r, s, t = 0 } = {}) {
  return `${[q, r, s, t]}`;
}

function fromKey(key) {
  const split = key.split(',');
  return { q: +split[0], r: +split[1], s: +split[2], t: +(split[3] || 1) };
}

function sameSigns(a, b) {
  return a > -1 && b > -1 || a < 0 && b < 0;
}

function getNeighbors(coords) {
  const { q, r, s, t } = fromKey(coords);

  return [
    toKey({ q: q + 1, r: r, s: s - 1, t }),
    toKey({ q: q - 1, r: r, s: s + 1, t }),
    toKey({ q: q + 1, r: r - 1, s: s, t }),
    toKey({ q: q - 1, r: r + 1, s: s, t }),
    toKey({ q: q, r: r + 1, s: s - 1, t }),
    toKey({ q: q, r: r - 1, s: s + 1, t }),
  ]
}

function addHexText(q, r, s, v) {
  const qText = document.createElementNS(xmlns, 'text');
  qText.textContent = q;
  qText.setAttributeNS(null, 'x', -3);
  qText.setAttributeNS(null, 'y', -3);

  const rText = document.createElementNS(xmlns, 'text');
  rText.textContent = r;
  rText.setAttributeNS(null, 'x', 5);
  rText.setAttributeNS(null, 'y', 1.5);

  const sText = document.createElementNS(xmlns, 'text');
  sText.textContent = s;
  sText.setAttributeNS(null, 'x', -3);
  sText.setAttributeNS(null, 'y', 5);

  const vText = document.createElementNS(xmlns, 'text');
  vText.textContent = v;
  vText.style.fill = 'red';
  vText.setAttributeNS(null, 'y', 1);
  vText.setAttributeNS(null, 'x', -2);

  return [qText, rText, sText, vText];
}

function radialToScreenCoords({ q, r, s }) {
  let x;

  if (q === s)
    x = 0;
  else if (sameSigns(q, s))
    x = Math.abs(q - s);
  else
    x = Math.abs(q) + Math.abs(s);

  x = (q > s ? -1 : 1) * x * horzSpacing;
  const y = r * vertSpacing;

  return { x, y };
}

function drawHexes(el, list, renderText = false) {
  for ([key, v] of list) {
    const { q, r, s, t } = fromKey(key);
    const { x, y } = radialToScreenCoords({ q, r, s });

    const cell = document.createElementNS(xmlns, 'g');
    cell.setAttributeNS(null, 'transform', `translate(${x}, ${y})`);

    const use = document.createElementNS(xmlns, 'use');
    use.setAttributeNS(null, 'href', '#hex');
    cell.appendChild(use);

    if (renderText) addHexText(q, r, s, t).forEach(txt => cell.appendChild(txt));

    list.set(key, cell);
    el.appendChild(cell);
  }
}

function translateRadialCoords({ q, r, s }, direction, distance = 1) {
  return {
    q: q + direction.q * distance,
    r: r + direction.r * distance,
    s: s + direction.s * distance
  };
}

function generateRadialCoords(l, { q, r, s, t = 0 } = {}, { left, top, right, bottom }, offset = false) {
  const origin = toKey({ q, r, s, t });
  const list = new Map(l);

  list.set(origin, t);
  let queue = [origin];

  while (queue.length > 0) {
    const v = queue.shift();

    getNeighbors(v).forEach(w => {
      const { q: wq, r: wr, s: ws } = fromKey(w);
      const rDist = Math.abs(wr - r);
      const alternating = rDist % 2;
      const dr = (rDist + alternating) / 2;

      const dLeft = ['right', 'both'].includes(offset) ? left - alternating : left;
      const dRight = ['left', 'both'].includes(offset) ? right - alternating : right;

      if ([
        !list.has(w),
        wr < bottom + r && wr > -top + r,
        wq > -dRight + q - dr && wq < dLeft + q + dr,
        ws > -dLeft + s - dr && ws < dRight + s + dr,
      ].every(v => v)) {
        list.set(w, dr);
        queue.push(w);
      }
    });
  }

  return list;
}

function translateCoords(map, translator) {
  const translated = new Map();

  for ([key, val] of map) {
    const { q, r, s, t } = fromKey(key);
    translated.set(toKey(translator({ q, r, s, t })), val);
  }

  return translated;
}

document.querySelectorAll('[name="select-elevation"]').forEach(el => {
  const gameboard = document.querySelector('.gameboard');

  el.addEventListener('change', function (e) {
    gameboard.dataset.viewElevation = this.value
  });
});

// function placeBuilding(buildingSelector, mapsheetSelector) {
//   const building = svg.querySelector(buildingSelector);
//   const bld2grid = document.createElementNS(xmlns, 'g');
//   const bld2origin = { q: 0, r: 0, s: 0 };

//   const bld2map2 = svg.querySelector(`${mapsheetSelector} ${buildingSelector}`);
//   const [q, r, s] = bld2map2.dataset.placement.split(',').map(n => +n);
//   const map2bld2place = { q, r, s };

//   bld2hexes = building.querySelector('[data-grid-footprint]').dataset.gridFootprint.split(':').map(coords => {
//     const [q, r, s] = coords.split(',').map(n => +n);
//     const { q: tq, r: tr, s: ts } = translateRadialCoords({ q, r, s }, map2bld2place);

//     return [toKey({ q: tq, r: tr, s: ts }), null];
//   });

//   const bld2screenCoords = radialToScreenCoords(translateRadialCoords(bld2origin, map2bld2place));
//   const bld2structure = document.createElementNS(xmlns, 'g');
//   bld2structure.setAttributeNS(null, 'transform', `translate(${bld2screenCoords.x}, ${bld2screenCoords.y})`)

//   building.querySelectorAll('[data-grid-footprint] > *').forEach(el => {
//     const use = document.createElementNS(xmlns, 'use');
//     use.setAttributeNS(null, 'href', `#${el.id}`);
//     el.classList.forEach(className => use.classList.add(className));
//     bld2structure.appendChild(use);
//   });

//   drawHexes(bld2grid, new Map(bld2hexes), true);

//   const bld2elvBasement = bld2grid.cloneNode(true);
//   bld2elvBasement.classList.add('elevation-basement');
//   bld2map2.appendChild(bld2elvBasement);

//   const bld2elv1 = bld2grid.cloneNode(true);
//   bld2elv1.classList.add('elevation-0');
//   bld2map2.appendChild(bld2elv1);

//   const bld2elv2 = bld2grid.cloneNode(true);
//   bld2elv2.classList.add('elevation-1');
//   bld2map2.appendChild(bld2elv2);

//   const bld2elvRoof = bld2grid.cloneNode(true);
//   bld2elvRoof.classList.add('elevation-roof');
//   bld2map2.appendChild(bld2elvRoof);

//   bld2map2.appendChild(bld2structure);
// }

const buildingHexes = {};

buildingHexes.bld1 = generateRadialCoords(
  new Map(),
  { q: 0, r: 0, s: 0 },
  { left: 3, top: 5, right: 3, bottom: 5 },
  'both'
);

buildingHexes.bld2 = [
  [{ q: 0, r: 0, s: 0 }, { left: 3, top: 5, right: 3, bottom: 5 }, 'both'],
  [{ q: 3, r: 0, s: -3 }, { left: 1, top: 2, right: 1, bottom: 4 }, 'right'],
  [{ q: -3, r: 0, s: 3 }, { left: 1, top: 2, right: 1, bottom: 4 }, 'left'],
].reduce((acc, args) => new Map([...generateRadialCoords(acc, ...args)]), new Map());

buildingHexes.bld3 = generateRadialCoords(
  new Map(),
  { q: 0, r: 0, s: 0 },
  { left: 2, top: 3, right: 2, bottom: 4 }
);

buildingHexes.bld4 = generateRadialCoords(
  new Map(),
  { q: 0, r: 0, s: 0 },
  { left: 2, top: 4, right: 3, bottom: 5 },
  'left'
);

buildingHexes.bld5 = generateRadialCoords(
  new Map(),
  { q: 0, r: 0, s: 0 },
  { left: 5, top: 3, right: 4, bottom: 2 }
);

buildingHexes.bld6 = generateRadialCoords(
  new Map(),
  { q: 0, r: 0, s: 0 },
  { left: 1, top: 5, right: 2, bottom: 4 }
);

buildingHexes.bld7 = [
  [{ q: 0, r: 0, s: 0 }, { left: 7, top: 4, right: 7, bottom: 3 }, 'left'],
  [{ q: 1, r: -4, s: 3 }, { left: 5, top: 1, right: 6, bottom: 1 }],
  [{ q: 5, r: 3, s: -8 }, { left: 1, top: 1, right: 2, bottom: 1 }],
  [{ q: -4, r: 3, s: 1 }, { left: 3, top: 1, right: 4, bottom: 1 }],
].reduce((acc, args) => new Map([...generateRadialCoords(acc, ...args)]), new Map());

buildingHexes.bld8 = [
  [{ q: 0, r: 0, s: 0 }, { left: 6, top: 7, right: 6, bottom: 4 }, 'both'],
  [{ q: 5, r: 2, s: -7 }, { left: 1, top: 2, right: 1, bottom: 2 }],
  [{ q: 1, r: 5, s: -6 }, { left: 4, top: 2, right: 4, bottom: 2 }, 'both'],
  [{ q: -2, r: 4, s: -2 }, { left: 1, top: 1, right: 1, bottom: 1 }],
  [{ q: 7, r: -7, s: 0 }, { left: 2, top: 1, right: 2, bottom: 1 }],
  [{ q: -2, r: -7, s: 9 }, { left: 2, top: 1, right: 2, bottom: 1 }],
  [{ q: -3, r: -6, s: 9 }, { left: 1, top: 1, right: 1, bottom: 2 }, 'left'],
  [{ q: -7, r: 3, s: 4 }, { left: 1, top: 3, right: 2, bottom: 3 }, 'right'],
  [{ q: -7, r: 4, s: 3 }, { left: 1, top: 1, right: 1, bottom: 1 }]
].reduce((acc, args) => new Map([...generateRadialCoords(acc, ...args)]), new Map());

const mapsheet1BuildingCoords = [
  translateCoords(buildingHexes.bld2, ({ q, r, s }) => ({ q: q + 7, r: r + 7, s: s - 14 })),
  translateCoords(buildingHexes.bld4, ({ q, r, s }) => ({ q: -s + 14, r: -r - 6, s: -q - 8 })),
  translateCoords(buildingHexes.bld3, ({ q, r, s }) => ({ q: q - 6, r: r - 6, s: s + 12 })),
  translateCoords(buildingHexes.bld6, ({ q, r, s }) => ({ q: -s - 12, r: -r + 7, s: -q + 5 })),
  generateRadialCoords(new Map(), { q: 0, r: 0, s: 0 }, { left: 4, top: 5, right: 3, bottom: 5 }),
];

const mapsheet2BuildingCoords = [
  translateCoords(buildingHexes.bld1, ({ q, r, s }) => ({ q: q, r: r + 7, s: s - 7 })),
  translateCoords(buildingHexes.bld2, ({ q, r, s }) => ({ q: q + 7, r: r + 7, s: s - 14 })),
  translateCoords(buildingHexes.bld3, ({ q, r, s }) => ({ q: q - 14, r: r + 5, s: s + 9 })),
  translateCoords(buildingHexes.bld4, ({ q, r, s }) => ({ q: q - 8, r: r + 6, s: s + 2 })),
  translateCoords(buildingHexes.bld5, ({ q, r, s }) => ({ q: q + 13, r: r - 6, s: s - 7 })),
  translateCoords(buildingHexes.bld6, ({ q, r, s }) => ({ q: q + 7, r: r - 6, s: s - 1 })),
  translateCoords(buildingHexes.bld7, ({ q, r, s }) => ({ q: q - 6, r: r - 5, s: s + 11 })),
];

const mapsheet3BuildingCoords = [
  translateCoords(buildingHexes.bld1, ({ q, r, s }) => ({ q: q - 2, r: r - 5, s: s + 7 })),
  translateCoords(buildingHexes.bld2, ({ q, r, s }) => ({ q: -s + 9, r: -r - 6, s: -q - 3 })),
  translateCoords(buildingHexes.bld3, ({ q, r, s }) => ({ q: -s + 17, r: -r - 7, s: -q - 10 })),
  translateCoords(buildingHexes.bld4, ({ q, r, s }) => ({ q: q - 9, r: r - 6, s: s + 15 })),
  translateCoords(buildingHexes.bld5, ({ q, r, s }) => ({ q: q + 6, r: r + 8, s: s - 14 })),
  translateCoords(buildingHexes.bld6, ({ q, r, s }) => ({ q: -s + 1, r: -r + 6, s: -q - 7 })),
  translateCoords(buildingHexes.bld7, ({ q, r, s }) => ({ q: q - 12, r: r + 8, s: s + 4 })),
]

const mapsheet4BuildingCoords = [
  translateCoords(buildingHexes.bld8, ({ q, r, s }) => ({ q: q + 1, r: r + 1, s: s - 2 })),
]

const mapsheetHexCoords = generateRadialCoords(new Map(), { q: 0, r: 0, s: 0 }, { left: 17, top: 13, right: 17, bottom: 14 }, 'left');

const mapsheet1hexCoords = new Map(mapsheetHexCoords);
const mapsheet2hexCoords = new Map(mapsheetHexCoords);
const mapsheet3hexCoords = new Map(mapsheetHexCoords);
const mapsheet4hexCoords = new Map(mapsheetHexCoords);

mapsheet1BuildingCoords.forEach(building => {
  for ([coords, v] of building) mapsheet1hexCoords.delete(coords);
});

mapsheet2BuildingCoords.forEach(building => {
  for ([coords, v] of building) mapsheet2hexCoords.delete(coords);
});

mapsheet3BuildingCoords.forEach(building => {
  for ([coords, v] of building) mapsheet3hexCoords.delete(coords);
});

mapsheet4BuildingCoords.forEach(building => {
  for ([coords, v] of building) mapsheet4hexCoords.delete(coords);
});

const gameboard = svg.querySelector('.gameboard');

let mapsheet1 = {
  id: 'mapsheet1',
  grid: new Map(mapsheetHexCoords),
  buildings: [
    {
      type: 'building2',
      grid: buildingHexes.bld2,
      position: ({ q, r, s }) => ({ q: q + 7, r: r + 7, s: s - 14 })
    },
    {
      type: 'building3',
      grid: new Map(buildingHexes.bld3),
      position: ({ q, r, s }) => ({ q: q - 6, r: r - 6, s: s + 12 })
    },
    {
      type: 'building4',
      grid: generateRadialCoords(
        new Map(),
        { q: 0, r: 0, s: 0 },
        { left: 2, top: 4, right: 3, bottom: 5 },
        'right'
      ),
      position: ({ q, r, s }) => ({
        q: q + 15,
        r: r - 7,
        s: s - 8,
        transform: (x, y) => `translate(${x + horzSpacing}, ${y})`
      })
    },
    {
      type: 'building6',
      grid: new Map(buildingHexes.bld6),
      position: rotate180({ q: -13, r: 7, s: 6 })
    },
    {
      type: 'terrain',
      grid: generateRadialCoords(
        new Map(),
        { q: 0, r: 0, s: 0 },
        { left: 3, top: 5, right: 3, bottom: 5 }
      ),
      position: ({ q, r, s }) => ({ q: q, r: r, s: s })
    }
  ]
};

let mapsheet2 = {
  id: 'mapsheet2',
  grid: new Map(mapsheetHexCoords),
  buildings: [
    {
      type: 'building1',
      grid: new Map(buildingHexes.bld1),
      position: ({ q, r, s }) => ({ q: q, r: r + 7, s: s - 7 })
    },
    {
      type: 'building2',
      grid: new Map(buildingHexes.bld2),
      position: ({ q, r, s }) => ({ q: q + 7, r: r + 7, s: s - 14 })
    },
    {
      type: 'building3',
      grid: new Map(buildingHexes.bld3),
      position: ({ q, r, s }) => ({ q: q - 14, r: r + 5, s: s + 9 })
    },
    {
      type: 'building4',
      grid: new Map(buildingHexes.bld4),
      position: ({ q, r, s }) => ({ q: q - 8, r: r + 6, s: s + 2 })
    },
    {
      type: 'building5',
      grid: new Map(buildingHexes.bld5),
      position: ({ q, r, s }) => ({ q: q + 13, r: r - 6, s: s - 7 })
    },
    {
      type: 'building6',
      grid: new Map(buildingHexes.bld6),
      position: ({ q, r, s }) => ({ q: q + 7, r: r - 6, s: s - 1 })
    },
    {
      type: 'building7',
      grid: new Map(buildingHexes.bld7),
      position: ({ q, r, s }) => ({ q: q - 6, r: r - 5, s: s + 11 }),
    },
  ]
};

let mapsheet3 = {
  id: 'mapsheet3',
  grid: new Map(mapsheetHexCoords),
  buildings: [
    {
      type: 'building1',
      grid: new Map(buildingHexes.bld1),
      position: ({ q, r, s }) => ({ q: q - 2, r: r - 5, s: s + 7 })
    },
    {
      type: 'building2',
      grid: new Map(buildingHexes.bld2),
      position: rotate180({ q: 9, r: -6, s: -3 })
    },
    {
      type: 'building3',
      grid: new Map(buildingHexes.bld3),
      position: rotate180({ q: 17, r: -7, s: -10 })
    },
    {
      type: 'building4',
      grid: new Map(buildingHexes.bld4),
      position: rotate180({ q: -10, r: -5, s: 15 })
    },
    {
      type: 'building5',
      grid: new Map(buildingHexes.bld5),
      position: ({ q, r, s }) => ({ q: q + 6, r: r + 8, s: s - 14 })
    },
    {
      type: 'building6',
      grid: new Map(buildingHexes.bld6),
      position: rotate180({ q: 0, r: 6, s: -6 })
    },
    {
      type: 'building7',
      grid: new Map(buildingHexes.bld7),
      position: ({ q, r, s }) => ({ q: q - 12, r: r + 8, s: s + 4 })
    },
  ]
};

let mapsheet4 = {
  id: 'mapsheet4',
  grid: new Map(mapsheetHexCoords),
  buildings: [
    {
      type: 'building8',
      grid: buildingHexes.bld8,
      position: ({ q, r, s }) => ({ q: q + 1, r: r + 1, s: s - 2 })
    },
  ]
}

function rotate180(coords) {
  return function ({ q, r, s }) {
    return {
      q: -q + coords.q,
      r: -r + coords.r,
      s: -s + coords.s,
      transform: (x, y) => `rotate(180 ${x}, ${y}) translate(${x}, ${y})`
    };
  };
}

function drawMapsheet(gameboard, { id, grid, buildings }, { q: pq, r: pr, s: ps }) {
  const container = document.createElementNS(xmlns, 'g');
  container.id = id;
  gameboard.appendChild(container);

  const gridContainer = document.createElementNS(xmlns, 'g');
  gridContainer.classList.add('elevation-0');
  container.appendChild(gridContainer);

  const buildingHexes = buildings.reduce((acc, building) => {
    const buildingContainer = document.createElementNS(xmlns, 'g');
    buildingContainer.classList.add(`building`);
    buildingContainer.classList.add(building.type);
    container.appendChild(buildingContainer);

    let buildingGrid = translateCoords(building.grid, building.position);
    buildingGrid = translateCoords(buildingGrid, ({ q, r, s }) => ({ q: q + pq, r: r + pr, s: s + ps }));

    [-1, 0, 1].forEach(elevationLevel => {
      const hexContainer = document.createElementNS(xmlns, 'g');
      hexContainer.classList.add(`elevation-${elevationLevel === -1 ? 'basement' : elevationLevel}`);
      buildingContainer.appendChild(hexContainer);

      buildingGrid = translateCoords(buildingGrid, ({ q, r, s }) => ({ q, r, s, t: elevationLevel }));
      drawHexes(hexContainer, buildingGrid, true);
      acc = new Map([...acc, ...buildingGrid]);
    });

    const buildingTemplate = document.querySelector(`defs #${building.type}`);
    const origin = building.position({ q: 0, r: 0, s: 0 });
    const { x, y } = radialToScreenCoords({ q: origin.q + pq, r: origin.r + pr, s: origin.s + ps });
    const transform = origin.transform || ((x, y) => `translate(${x}, ${y})`);
    const buildingStructure = document.createElementNS(xmlns, 'g');
    buildingStructure.classList.add('structure');
    buildingStructure.setAttributeNS(null, 'transform', transform(x, y));
    buildingContainer.appendChild(buildingStructure);

    for (let child of buildingTemplate.children) {
      const use = document.createElementNS(xmlns, 'use');
      use.setAttributeNS(null, 'href', `#${child.id}`);
      child.classList.forEach(className => use.classList.add(className));
      buildingStructure.appendChild(use);
    }

    return acc;
  }, new Map());

  grid = translateCoords(grid, ({ q, r, s }) => ({ q: q + pq, r: r + pr, s: s + ps }));

  for ([coords, v] of buildingHexes) grid.delete(coords);
  drawHexes(gridContainer, grid, true);

  return new Map([...grid, ...buildingHexes]);
  // return { id, grid, buildings };
}

const horzMapVect = function(coords) {
  return vectorAdd(coords, { q: 1, r: 0, s: -1 }, 33);
}

const vertMapVect = function(coords) {
  return vectorAdd(coords, { q: 1, r: -2, s: 1 }, 13);
}

function vectorAdd({ q, r, s }, { q: dq, r: dr, s: ds }, scalar) {
  return ({ q: q - dq * scalar, r: r + dr * scalar, s: s - ds * scalar });
}

function findMult(arr) {
  if (arr.length % 2)
    return arr.map((v, index) => {
      const row = v.length % 2 ? v.map((rv, rindex) => [Math.floor(rindex - v.length / 2) + 1, rv]) : v.map((rv, rindex) => [Math.floor(rindex - v.length / 2), rv]).map(([rm, rv]) => [rm > -1 ? rm + 1 : rm, rv]);
      return [Math.floor(index - arr.length / 2) + 1, row];
    });
  else
    return arr.map((v, index) => {
      const row = v.length % 2 ? v.map((rv, rindex) => [Math.floor(rindex - v.length / 2) + 1, rv]) : v.map((rv, rindex) => [Math.floor(rindex - v.length / 2), rv]).map(([rm, rv]) => [rm > -1 ? rm + 1 : rm, rv]);
      return [Math.floor(index - arr.length / 2), row];
    }).map(([m, v]) => [m > -1 ? m + 1 : m, v]);
}

function findScalar(arr) {
  let pos;
  let neg;

  if (arr.length % 2) {
    pos = -13;
    neg = -13;
  } else {
    pos = -7;
    neg = -6;
  }

  return arr.map(([mult, v]) => {
    let hpos, hneg;

    if (v.length % 2) {
      hpos = 33;
      hneg = 33;
    } else {
      hpos = 16;
      hneg = 17;
    }

    const row = v.map(([hmult, hv]) => [hmult < 0 ? hmult * hneg : hmult * hpos, hv]);
    return [mult < 0 ? mult * neg : mult * pos, row];
  });
}

let sheets = [];

// sheets = [[mapsheet1]];
// sheets = [[mapsheet3]];
// sheets = [[mapsheet2], [mapsheet3]];
sheets = [[mapsheet2], [mapsheet1], [mapsheet3]];

// sheets = [
//   [mapsheet2, mapsheet1],
//   [mapsheet3, mapsheet4]
// ];

findScalar(findMult(sheets)).forEach(([vscalar, row]) => {
  const vertMapVect = function(coords) {
    return vectorAdd(coords, { q: 1, r: -2, s: 1 }, vscalar);
  }

  row.forEach(([hscalar, ms]) => {
    const horzMapVect = function(coords) {
      return vectorAdd(coords, { q: 1, r: 0, s: -1 }, hscalar);
    }

    ms = drawMapsheet(gameboard, ms, horzMapVect(vertMapVect({ q: 0, r: 0, s: 0 })));
  })
});

const circle = document.createElementNS(xmlns, 'circle');
circle.setAttributeNS(null, 'r', 5);
circle.setAttributeNS(null, 'fill', 'green');
circle.setAttributeNS(null, 'stroke', 'gold');
circle.setAttributeNS(null, 'stroke-width', 1);

const circle1 = circle.cloneNode();
circle1.setAttributeNS(null, 'fill', 'blue');

const circle2 = circle.cloneNode();
circle2.setAttributeNS(null, 'fill', 'red');

// mapsheet2.get('0,0,0,0').appendChild(circle);
// mapsheet2.get('0,6,-6,1').appendChild(circle1);
// mapsheet2.get('0,9,-9,0').appendChild(circle2);

function addGroup(container, className) {
  const g = document.createElementNS(xmlns, 'g');
  g.classList.add(className);
  container.appendChild(g);
  return g;
}